JP2005171659A - Vibration isolation construction method for existing building and vibration isolated building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolation construction method for an existing building by which a vibration isolation device is installed on a middle story of an existing building without disturbing usual business in the building, and vibration isolation of the building is attained by a simple work and in a short period. <P>SOLUTION: New columns 11 are disposed on the outside of existing outer peripheral columns 2, respectively, in an integrating manner. The vibration isolation devices 15 are interposed at predetermined positions of the new columns 11, respectively. At least one or more new beams 12 are disposed along a roof floor face of the existing building 1, and both ends of the new beams 12 are joined to any of the new columns 11, by which an external frame 10 comprising the new columns and the new beams may be structured on the outer peripheral part of the existing building. After that, supporting members 18 are embedded in existing internal columns 3, respectively, to extend from the positions near the parts where the existing internal columns 3 are planned to be cut to the new beams 12. The existing internal columns 3 and the existing outer peripheral columns 2 are cut in a state that the load applied to the existing internal columns is supported by the new beams 12 in a hanging manner through the supporting members 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a seismic isolation method for an existing building in which the existing building is isolated by installing a seismic isolation device on an intermediate floor of the existing building, and to a seismic isolation building to which this is applied.

  In recent years, in various existing buildings such as reinforced concrete (RC), steel reinforced concrete (SRC), or steel (S), seismic isolation equipment has been added to specific floors to segregate the entire building or part of it. There is a growing demand for buildings. Since such existing buildings are generally seismically isolated by inserting a new seismic isolation device at the base, middle, or column base of a building or at a specific level, It is necessary to cut once.

  For this reason, a method of temporarily supporting a load acting on an axial force material such as the above-mentioned column by arranging a number of temporary axial force support members separately between beams and floor slabs is known, In the existing building, since general work and work are always performed, the development of a seismic isolation method that enables seismic isolation repair while using the existing building without hindering the normal work as much as possible has been developed. There is a strong demand.

On the other hand, although it is a structural technique different from the seismic isolation method described above, as a method for enabling seismic reinforcement while using an existing building, for example, a seismic damping reinforcement method shown in Patent Document 1 is known. Yes. In this seismic retrofitting method, a structure is adopted in which the extension pillar and the extension beam are attached so as to be integrated with the outside of the pillar and beam of the existing building, and a seismic isolation device is inserted in the middle of the extension pillar or the head of the pillar . According to this seismic reinforcement method, it is possible to suppress the shaking of the building at the time of the earthquake, and it is possible to obtain an advantage that the construction can be performed while staying without impairing the habitability of the existing building.
JP-A-11-229631

  However, since the method described in Patent Document 1 is a construction method aimed at seismic reinforcement in the first place, it cannot be directly applied to the seismic isolation method for existing buildings. In other words, in the seismic isolation method for existing buildings, as described above, it is necessary to insulate vibrations transmitted from the ground to the existing building by cutting the existing columns on the specific floor. It is necessary to take separate structural measures to support the load that is being cut and after cutting. In addition, for internal pillars that are placed in the middle of existing buildings, additional pillars that are integrated with them cannot be provided outside the building. In that case, there are concerns that not only the living space and office space inside the building will be reduced, but also the noise during construction of the extension pillars will hinder normal operations.

  The present invention has been made in view of such circumstances, and it is possible to install a seismic isolation device on the intermediate floor of an existing building without hindering normal operations in the building, and in a short time with simple work. The purpose is to provide a seismic isolation method for an existing building and a seismic isolation building that can be seismically isolated.

  The invention according to claim 1 is a seismic isolation method in which a seismic isolation layer is provided by interposing a seismic isolation device on an intermediate floor of an existing building, and a column disposed along the outer periphery of the existing building The existing outer peripheral pillars and the pillars arranged in the middle part are used as the existing inner pillars, and new pillars are provided outside each existing outer peripheral pillar, and the seismic isolation device is installed at a predetermined part of the new pillars. In addition to interposing each other, at least one new beam is provided along the roof of the existing building, and both ends thereof are joined to one of the new columns, so that the new column is installed on the outer periphery of the existing building. After constructing the external frame consisting of the above-mentioned new beam and the above-mentioned new beam, bearing members are embedded in each existing internal column from the vicinity of the planned cutting position to the new beam of the above-mentioned external frame. Work on each existing internal pillar via member Doing load while supporting suspended in new beams of the external frame, is characterized in that it has an existing internal pillars and existing periphery pillar so as to cut respectively.

  The invention according to claim 2 is a seismic isolation method in which an isolation layer is provided by installing an isolation device on an intermediate floor of an existing building, and each of the existing outer peripheral columns is placed across the isolation layer. Newly installed columns are provided on the outside, and the seismic isolation devices are respectively installed in the preset parts of the newly installed columns, and the new columns are integrated with the existing outer peripheral columns. The present invention is characterized in that an existing outer peripheral column is cut.

  According to a third aspect of the present invention, in the seismic isolation method for an existing building according to the first or second aspect, the existing outer peripheral column is cut in a state where an axial force assumed in advance is introduced into the seismic isolation device. It is characterized by that.

  The invention described in claim 4 is a seismic isolation building in which a seismic isolation layer is provided by interposing a seismic isolation device on an intermediate floor, and a new column is integrated on the outside of each outer peripheral column. The seismic isolation devices are respectively installed at predetermined portions of the new pillars, and at least one or more new beams are provided along the roof surface. By joining to one of the columns, an outer frame composed of the new column and the new beam is constructed on the outer periphery of the building, and the inner frame is provided with the outer frame from the seismic isolation layer. The support members are embedded over the range up to the new beam of the inner column, and the load acting on each internal column is suspended and supported by the new beam of the outer frame through the support member. And the outer column are in the above-mentioned seismic isolation layer And it is characterized in that it is disconnected.

  The invention according to claim 5 is a seismic isolation building in which a seismic isolation layer is provided by interposing a seismic isolation device on an intermediate floor, and on the outer side of each outer peripheral column so as to straddle the seismic isolation layer. New pillars are provided respectively, and these new pillars are integrated with the outer peripheral pillars, and the seismic isolation devices are respectively installed at predetermined portions of the new pillars, so that the outer peripheral pillars are installed in the seismic isolation layer. It is cut | disconnected, It is characterized by the above-mentioned.

According to the invention described in claim 1 or 4, the new columns are provided so as to be integrated on the outside of the existing outer peripheral columns, and the seismic isolation device is interposed in each of the new columns, and on the roof of the existing building. In the state where the new beam with both ends joined to the new column is provided and the load acting on the existing inner column is supported by the new beam, the existing inner column and the existing outer column are cut. Therefore, most of the work related to seismic isolation of existing buildings, excluding the cutting of existing pillars, can be performed outside the existing building.
Moreover, in the existing building only with the outer peripheral column and without the inner column, as in the invention according to claim 2 or 5, a new column is provided outside each existing outer peripheral column so as to straddle the seismic isolation layer. In the state where the seismic isolation devices are respectively installed in the preset parts of the columns and the new columns are integrated with the existing outer peripheral columns, by cutting each existing outer peripheral column with the seismic isolation layer, Most of the work can be done outside the existing building.
Therefore, according to the present invention, it is possible to perform seismic isolation repair while using an existing building without hindering normal operations in the building. In other words, in the conventional seismic isolation method, the floor (base isolation floor) for constructing the base isolation layer became unusable during construction and needed to be temporarily relocated. According to the seismic construction method, since the use of the seismic isolation floor can be continued even during construction, the labor and cost for the relocation can be saved.

Also, when cutting existing internal columns and existing outer peripheral columns, compared to the case where a number of temporary axial force support members are arranged separately between beams and floor slabs to temporarily support the axial force in the existing building, Since large-scale removal work such as the removal and carry-out work of the axial force support member is not required, the work can be greatly saved, and the existing building can be seismically isolated in a short time.
In addition, the external frame was constructed on the outer periphery of the existing building, and the existing internal column was suspended and supported by the new beam of the external frame, and the axial force of the existing outer peripheral column was borne by the new column of the external frame. Therefore, the existing building can be seismically isolated without reducing the effective space in the existing building.

  Further, according to the invention described in claim 3, since the existing outer peripheral column is cut in a state where the axial force assumed in advance is introduced into the seismic isolation device, the load is reliably ensured when the existing column is cut. It can be transmitted to and supported by the external frame, and distortion due to load transfer after cutting of the existing column can be suppressed.

1 to 3 show an embodiment of a seismic isolation building to which the seismic isolation method for an existing building according to the present invention is applied. In the figure, reference numeral 1 denotes an existing building, and reference numeral 2 denotes an outer peripheral portion of the existing building 1. The existing outer peripheral pillars arranged at, and the existing internal pillars denoted by reference numeral 3 in the middle part.
This seismic isolation method was applied to an existing building such as an RC structure when an isolation layer was provided on the intermediate floor with an isolation device installed. First, as shown in FIGS. The large external frame 10 is constructed on the outer peripheral side of the existing building 1.

  Here, the external frame 10 is provided along the roof surface of the existing building 1 and the new pillar 11 provided so as to be integrated with the existing outer peripheral column 2 outside each existing outer peripheral column 2, and both end portions thereof are It is comprised by the new beam 12 joined to the new pillar 11 (11A). The structure form of the external frame 10 can be appropriately selected according to the structure form of the existing building 1 such as RC structure, SRC structure or S structure.

  Each of the new pillars 11 is provided so as to straddle the intermediate floor (the first floor in the present embodiment) serving as a seismic isolation floor, and a seismic isolation device made of laminated rubber with lead plugs or the like at a position corresponding to the base isolation floor 15 is interposed. As shown in FIGS. 2 and 3, the new pillar 11 includes a first new pillar 11 </ b> A that reaches the rooftop and a second new pillar 11 </ b> B that is located between the rooftop and the seismic isolation floor. Included, here, among the combinations of the new columns 11 arranged on the core as the existing internal columns 3 exist, the new columns 11 having the combinations in which the distance between the new columns 11 is the shortest are respectively newly established. A new beam 12 is constructed between the heads of the first new pillars 11A. In addition, the new pillar 11 is set so that a cross section becomes larger than the existing outer peripheral pillar 2 integrated in the site | part in which the seismic isolation apparatus 15 is interposed, The said new pillar 11 and the existing outer peripheral pillar 2 and It is possible to appropriately adopt a well-known integrated method according to the structure form of both. For example, when both are RC structures, they are integrated using post-installed anchors. Therefore, it is possible to suppress vibration and noise associated with construction. Further, when installing the seismic isolation device 15, an assumed axial force is introduced into the seismic isolation device 15 in advance so that the load transfer after the cutting of the existing outer peripheral column 2 is performed in a stable state. Even if the seismic isolation device 15 is installed using a jacking method or the like after the seismic isolation device 15 is installed, the shaft is attached to the seismic isolation device 15 even when the seismic isolation device 15 is applied with an axial force. A retrofitting method in which force is applied may be used.

After constructing the external frame 10 having the above-described configuration, the center portion of each existing internal pillar 3 is cored from the top, and an insertion hole extending from the new rooftop beam 12 to the vicinity of the cutting position of the existing internal pillar 3 is formed. To do. Then, as shown in FIG. 3, by passing a PC steel rod (support member) 18 through the insertion hole of each existing internal pillar 3, respectively, and introducing prestress into this, both ends are fixed with a fixing jig. The load acting on each existing internal column 3 can be suspended and supported by the new beam 12 of the external frame 10.
In parallel with or before or after the construction of the external frame 10, seismic isolation work such as the interior / exterior walls, stairs, elevators, and equipment piping of the seismic isolation floor is carried out, and these facilities are subjected to relative displacement during an earthquake. Be prepared to follow up.

  And when the above construction is completed, the axial force assumed in advance is introduced into the seismic isolation device 15, and the existing internal column 3 can be suspended and supported by the new beam 12 of the external frame 10 due to the tension of the PC steel rod 18. Then, the existing outer peripheral column 2 and the existing inner column 3 are cut simultaneously at a predetermined height position on the seismic isolation floor. As a result, the load acting on each existing outer column 2 is transferred to the seismic isolation device 15 of the newly installed column 11 integrated therewith, and the load acting on each existing inner column 3 is PC steel rod. 18 is suspended and supported by the newly installed beam 12. With the load transfer from the existing columns 2 and 3 to the external frame 10, the seismic isolation work for the existing building 1 is completed. In addition, the existing internal pillar 3 is hold | maintained with a cut state.

  As described above, according to the seismic isolation method for the existing building, the new pillar 11 is provided so as to be integrated outside the existing outer peripheral pillar 2, and the seismic isolation device 15 is interposed in each of the new pillars 11. In addition, a new beam 12 having both ends joined to the new pillar 11A is provided on the roof of the existing building 1, and the load acting on the existing internal pillar 3 is suspended and supported by the new beam 12 in the existing building 1 Since the outer pillar 2 and the existing inner pillar 3 are cut, the majority of the work related to the seismic isolation of the existing building 1 excluding the cutting of the existing pillars 2 and 3 is performed outside the existing building 1. It becomes possible to do. Therefore, it is possible to perform seismic isolation repair while using the existing building 1 without hindering normal business in the building.

In addition, when cutting the existing outer peripheral column 2 and the existing inner column 3, it is compared with the case where a large number of temporary axial force support members are separately provided between beams and floor slabs to temporarily support the axial force in the existing building 1. Thus, it is possible to perform seismic isolation repair without a large removal work such as the removal and removal work of the axial force support member.
In addition, the external frame 10 is constructed on the outer periphery of the existing building 1, and the existing inner pillar 3 is suspended and supported by the new beam 12 of the outer frame 10, and the existing outer pillar 2 of the outer frame 10 is supported by the new pillar 11 of the outer frame 10. Since the axial force is borne, the existing building 1 can be seismically isolated without reducing the effective space in the existing building.

  Furthermore, in this embodiment, in a state where the cross section of the newly installed column 11 is made larger than the cross section of the existing outer peripheral column 2 in the mounting site of the seismic isolation device 15 and the axial force assumed in advance is introduced into the seismic isolation device 15, Since the existing outer peripheral column 2 is cut, when the existing columns 2 and 3 are cut, the load can be reliably transmitted to and supported by the external frame 10, and the load transition after the existing columns 2 and 3 are cut. Can suppress distortion.

  In the present embodiment, the legs of each new pillar 11 are extended underground, and each new pillar 11 is configured by an upper structure above and below the ground level. For example, as shown in FIG. 4, the reinforcing beam 19 is provided so as to be integrated with any of the existing beams on the first floor, and both ends of the reinforcing beam 19 are joined to the new pillar 11. By doing so, it is possible to omit the lower structure of a part of the new pillars 11C joined to the reinforcing beam 19. In this case, in the new pillar 11C in which the lower structure is omitted, the PC steel wire 20 or the like is passed between the leg portion and the existing outer peripheral pillar 2, and pre-stress is introduced into the steel pillar 20 to fix both ends. It is desirable to improve the integrity with the outer peripheral column 2.

  Further, in the present embodiment, each existing internal pillar 3 is suspended and supported by the new beam 12 of the outer frame 10, but for example, as shown in FIG. The new pillar 11D may be provided so as to be integrated, and a seismic isolation device 16 such as an elastic sliding bearing may be interposed in the new pillar 11C.

  Furthermore, in the present embodiment, the case where the seismic isolation method according to the present invention is applied to the existing building 1 having the internal pillar 3 is exemplified, but the present invention is not limited to this. It is possible to apply the seismic isolation method according to the present invention to an existing building with no internal pillar 3 alone. In that case, it is only necessary to omit the new beam 12 and form the outer frame only by the new column 11 and to support the load acting on the existing outer peripheral column 2 by the new column 11.

In the top view which shows one Embodiment of the seismic isolation building which applied the seismic isolation method of the existing building which concerns on this invention, the seismic isolation floor is shown. It is sectional drawing along the AA line of FIG. It is sectional drawing along the BB line of FIG. It is a figure which shows the modification of an external frame. It is a figure which shows the other modification of an external frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing building 2 Existing outer peripheral column 3 Existing internal column 10 External frame 11 New column 12 New beam 15 Seismic isolation device 18 PC steel bar (support member)

Claims (5)

A seismic isolation method that provides a seismic isolation layer by installing seismic isolation devices on the intermediate floor of an existing building,
New pillars are provided on the outside of each existing outer peripheral pillar, and the seismic isolation device is interposed in a predetermined portion of each new pillar, and at least one or more along the roof of the existing building After constructing an external frame consisting of the new pillar and the new beam on the outer periphery of the existing building by connecting both ends of the new beam to one of the new pillars, each existing internal Inside the pillar, bearing members are embedded in the range from the vicinity of the planned cutting position to the newly installed beam of the outer frame, and the load acting on each existing inner pillar is transmitted through the bearing members as described above. A seismic isolation method for an existing building, in which the existing inner column and the existing outer column are cut in a state where they are suspended and supported by a new beam on the outer frame. A seismic isolation method that provides a seismic isolation layer by installing seismic isolation devices on the intermediate floor of an existing building,
New columns are installed outside the existing outer peripheral columns so as to straddle the seismic isolation layer, and the seismic isolation devices are respectively installed in the preset parts of the new columns, and the new columns are used as the existing outer peripheral columns. A seismic isolation method for an existing building, wherein each existing outer peripheral column is cut in the seismic isolation layer in an integrated state.   3. The seismic isolation method for an existing building according to claim 1 or 2, wherein an existing outer peripheral column is cut in a state where an axial force assumed in advance is introduced into the seismic isolation device. It is a seismic isolation building with a seismic isolation layer by installing a seismic isolation device on the intermediate floor,
New pillars are provided on the outer sides of the outer peripheral pillars, respectively, and the seismic isolation devices are respectively installed at predetermined portions of the new pillars, and at least one or more along the roof surface. The new frame is provided, and both ends thereof are joined to any of the new columns, so that an external frame composed of the new columns and the new beams is constructed on the outer periphery of the building.
Within each internal column, bearing members are embedded over the range from the seismic isolation layer to the new beam of the external frame, and the load acting on each internal column is received via these bearing members. A base-isolated building characterized in that an inner column and an outer column are cut by the base isolation layer while being suspended and supported by the new beam of the outer frame. It is a seismic isolation building with a seismic isolation layer by installing a seismic isolation device on the intermediate floor,
New pillars are provided outside the outer peripheral columns so as to straddle the seismic isolation layer, and these new pillars are integrated with the outer peripheral columns. A base-isolated building, characterized in that each outer peripheral column is cut at the base isolation layer.

Images